refactor: move templates into src/data/ directory

[jamesadevine]

Summary

Move pipeline templates from the top-level templates/ directory into src/data/ alongside ecosystem_domains.json, keeping injected content (templates, data files) separate from source code.

Changes

• Move 4 template files: base.yml, 1es-base.yml, init-agent.md, threat-analysis.md → src/data/
• Update test path in compiler_tests.rs
• Update documentation in AGENTS.md (architecture tree + 3 path references)
• Update workflow path filters in rust-tests.yml, rust-pr-reviewer.md, rust-pr-reviewer.lock.yml — templates/** glob removed since src/** now covers them
• Update workflow prompts in doc-freshness-check.md, red-team-security.md

[github-actions]

🔍 Rust PR Review

Summary: Looks good — clean refactoring with all paths updated correctly and the build verified.

Findings

✅ What Looks Good

• All include_str!() path math is correct: files in src/compile/ use ../data/<file>, src/init.rs uses data/<file> — verified by a successful cargo build with no errors
• The templates/** path filter removal from workflow triggers is correct since src/** now covers those files
• AGENTS.md architecture tree is now more accurate — it also adds the previously-missing ecosystem_domains.json entry, which is a nice bonus
• Test path update in compiler_tests.rs (CARGO_MANIFEST_DIR/src/data/base.yml) is correct
• No behavioral changes — pure file relocation using include_str! (compile-time embedding), so there's no runtime path resolution to worry about

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